TW202025842A - Handover timing method, terminal device and network device - Google Patents

Abstract

Disclosed in the present invention is a handover timing method, a terminal device, a network device, a chip, a computer readable storage medium, a computer program product and a computer program, the method comprising: receiving at least one timer for at least one target network device and/or a shared timer, wherein the duration of the shared timer is at least longer than the maximum duration of the timer for the at least one target network device.

Description

A switching timing method, terminal equipment and network equipment

The present invention relates to the field of information processing technology, in particular to a switching timing method, terminal equipment, network equipment, chip, computer-readable storage medium, computer program product, and computer program.

In mobile communication processing, handover may fail during the handover process. Usually, the reasons for handover failure are T304 timeout; T307 timeout; T312 timeout, etc. After the handover fails, the terminal device needs to initiate radio resource control (RRC, Radio Resource Control). Control) The connection is re-established.

For the terminal device switching process, there may be a way to configure multiple target base stations for the terminal device, so that the terminal device can select the target base station as soon as possible when the terminal device switches to ensure that the terminal device quickly completes the switching process. However, in such a processing method, how to control the connection of the terminal device is a problem that needs to be solved.

To solve the above technical problems, embodiments of the present invention provide a switching timing method, terminal equipment, network equipment, chip, computer readable storage medium, computer program product, and computer program.

In the first aspect, an embodiment of the present invention provides a handover timing method, applied to a terminal device, including: receiving at least one timer for at least one target network device, and/or, a common timer; wherein, the common timer The duration of the device is at least greater than the maximum duration of the timer for at least one target network device.

In an embodiment, after receiving at least one timer for at least one target network device, and/or, after the common timer, the method further includes: when a handover command is received, starting the first target network The first timer of the device and the public timer are started to initiate a connection to the first target network device.

In an embodiment, after initiating the connection to the first target network device, the method further includes: when the first timer of the first target network device is stopped, and/or the connection to the first target network device fails If the public timer does not expire, select a second target network device from at least one target network device, initiate a connection to the second target network device, and start the timer of the second target network device; or , When the first timer of the first target network device is stopped and/or the connection to the first target network device fails, if the public timer does not expire, the second target network device is acquired based on the switching command, and the The second target network device initiates a connection and starts a timer of the second target network device.

In an embodiment, the method further includes: when the public timer expires, confirming that the handover fails, returning to the connection with the source network device, or initiating connection re-establishment.

In an embodiment, the first target network device and the second target network device are the target network devices when the terminal device is switched; or, the first target network device and the second target network The device is the auxiliary node SN, and the source network device is the master node MN.

In a second aspect, an embodiment of the present invention provides a handover timing method applied to a source network device, including: configuring a terminal device with at least one timer for at least one target network device, and/or a common timer; where , The duration of the public timer is at least greater than the maximum duration of the timer for at least one target network device.

In an embodiment, the configuring the terminal device with at least one timer for at least one target network device, and/or, the public timer includes: carrying at least one timer for at least one target network device in the handover command A timer, and/or, a common timer, sends the switching command to the terminal device.

In an embodiment, the method further includes: selecting a target network device based on a measurement report corresponding to at least one network device; or, randomly selecting a target network device from the at least one network device.

In an embodiment, the first target network device and the second target network device are the target network devices when the terminal device is switched; or, the first target network device and the second target network The device is the auxiliary node SN, and the source network device is the master node MN.

In a third aspect, an embodiment of the present invention provides a terminal device, including: a first communication unit that receives at least one timer for at least one target network device, and/or, a public timer; wherein, the public timer The duration of is at least greater than the maximum duration of the timer for at least one target network device.

In an embodiment, the terminal device further includes: a first processing unit, when a handover command is received, starts a common timer, and initiates a connection to the first target network device through the first communication unit.

In an embodiment, the first processing unit determines the second target network device when the connection to the first target network device fails, or when the public timer stops and the connection to the first target network device is unsuccessful , Restart the public timer, and initiate a connection to the second target network device through the first communication unit.

In an embodiment, the first processing unit determines whether the number of restarts of the public timer exceeds a preset threshold, and if it exceeds, confirms that the handover has failed, and returns to the connection with the source network device, or initiates Connection re-establishment; or, determine whether the number of times of reselecting the target network device exceeds the preset selection threshold, if it exceeds, confirm that the switch has failed, return to the connection with the source network device, or initiate connection re-establishment.

In one embodiment, the first processing unit selects the second target network device from at least one target network device when the connection to the first target network device fails and the public timer has not expired, through The first communication unit initiates a connection to the second target network device; or, when the connection of the first target network device fails and the public timer does not expire, obtain the second target network device configured in the switching command , Initiate a connection to the second target network device through the first communication unit.

In an embodiment, the first processing unit, when the common timer expires, confirms that the handover has failed, and returns to the connection with the source network device through the first communication unit, or initiates connection reestablishment.

In one embodiment, the terminal device further includes: a first processing unit, when receiving a handover command, start a first timer for the first target network device, and send it to the first target network via the first communication unit The device initiates a connection.

In one embodiment, when the first target network device fails to connect, the first processing unit selects a second target network device from at least one target network device to initiate a connection, and activates the second target network device. Or, when the connection of the first target network device fails, obtain the second target network device configured in the switching command, initiate a connection to the second target network device, and start the The second timer of the second target network device.

In a fourth aspect, an embodiment of the present invention provides a source network device, including: a second communication unit configured to configure at least one timer for at least one target network device, and/or a common timer, to the terminal device; wherein, The duration of the public timer is at least greater than the maximum duration of the timer for at least one target network device.

In an embodiment, the second communication unit carries at least one timer for at least one target network device in the handover command, and/or a common timer, and sends the handover command to the terminal device.

In an embodiment, the source network device further includes: a second processing unit, which selects a target network device based on a measurement report corresponding to at least one network device; or, randomly selects from the at least one network device Target network device.

In an embodiment, the first target network device and the second target network device are the target network devices when the terminal device is switched; or, the first target network device and the second target network The device is the auxiliary node SN, and the source network device is the master node MN.

In the fifth aspect, an embodiment of the present invention provides a terminal device, including a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the first aspect or its implementations.

In a sixth aspect, a network device is provided, including a processor and a memory. The memory is used to store computer programs, and the processor is used to call and run the computer programs stored in the memory to execute the methods in the second aspect or each of its implementations.

In a seventh aspect, a wafer is provided, which is used to implement any one of the above-mentioned first aspect to the second aspect or the method in each implementation manner thereof.

Specifically, the chip includes: a processor for calling and running computer programs from the memory, so that the device installed with the chip executes any one of the first aspect to the second aspect or each of the implementations thereof Methods.

In an eighth aspect, a computer-readable storage medium is provided for storing a computer program that enables a computer to execute any one of the first aspect to the second aspect or the method in each implementation manner thereof.

In a ninth aspect, a computer program product is provided, including computer program instructions that cause a computer to execute any one of the first aspect to the second aspect or the method in each implementation manner thereof.

In a tenth aspect, a computer program is provided, which when running on a computer, causes the computer to execute any one of the above-mentioned first to second aspects or the methods in each implementation manner thereof.

According to the technical solution of the embodiment of the present invention, the terminal device can configure at least one timer corresponding to at least one target network device and/or a public timer during the handover phase; so that the terminal device is configured with at least one target network device. When the device is used, the switching process is controlled based on the corresponding timer and/or public timer, so as to ensure the processing efficiency of re-establishing a connection with the target network device.

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, and broadband code division multiple access (CDMA) system. Take (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE frequency division duplex (Freq terminal equipment ncy Division Duplex, FDD) ) System, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system or 5G system, etc.

Exemplarily, the communication system 100 applied in the embodiment of the present application may be as shown in FIG. 1. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal device 120 (or called a communication terminal or a terminal). The network device 110 can provide communication coverage for a specific geographic area, and can communicate with terminal devices located in the coverage area. Optionally, the network equipment 110 may be a network equipment (Base Transceiver Station, BTS) in a GSM system or a CDMA system, a network equipment (NodeB, NB) in a WCDMA system, or an LTE system The evolved network equipment (Evolutional Node B, eNB or eNodeB) in the cloud radio access network (Cloud Radio Access Network, CRAN), or the network equipment can be a mobile switching center, Relay stations, access points, in-vehicle devices, wearable devices, hubs, switches, bridges, routers, network side devices in 5G networks, or future evolution of public land mobile networks (Public Land Mobile Network, PLMN) Network equipment, etc.

The communication system 100 also includes at least one terminal device 120 located within the coverage area of the network device 110. As used herein, "terminal equipment" includes, but is not limited to, connection via wired lines, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cables, and direct cables Connection; and/or another data connection/network; and/or via a wireless interface, such as for mobile networks, wireless local area networks (WLAN), digital TV networks such as DVB-H networks , Satellite network, AM-FM broadcast transmitter; and/or another terminal device that is set to receive/send communication signals; and/or Internet of Things (IoT) equipment. A terminal device set to communicate through a wireless interface can be called a "wireless communication terminal", a "wireless terminal" or a "mobile terminal". Examples of mobile terminals include, but are not limited to, satellites or mobile phones; Personal Communications System (PCS) terminals that can combine cellular radio phones with data processing, fax, and data communication capabilities; can include radio phones, pagers, and the Internet PDA with road/intranet access, Web browser, note book, calendar, and/or Global Positioning System (GPS) receiver; and conventional laptop and/or palmtop receiver or including radio telephone Other electronic devices of the transceiver. Terminal equipment can refer to access terminal, user equipment (User Equipment, terminal equipment), user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal, Wireless communication equipment, user agent or user device. Access terminals can be mobile phones, wireless phones, Session Initiation Protocol (SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal Digital Assistant, PDA), with wireless communication functions Handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in 5G networks, or terminal devices in the future evolution of PLMN, etc.

Optionally, direct terminal connection (Device to Device, D2D) communication may be performed between the terminal devices 120.

Optionally, the 5G system or 5G network may also be referred to as a New Radio (NR) system or NR network.

Figure 1 exemplarily shows one network device and two terminal devices. Optionally, the communication system 100 may include multiple network devices and the coverage of each network device may include other numbers of terminal devices. This embodiment of the application does not limit this.

Optionally, the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which are not limited in the embodiment of the present application.

It should be understood that the devices with communication functions in the network/system in the embodiments of the present application may be referred to as communication devices. Taking the communication system 100 shown in FIG. 1 as an example, the communication equipment may include a network equipment 110 with communication functions and a terminal equipment 120. The network equipment 110 and the terminal equipment 120 may be the specific equipment described above. To repeat; the communication device may also include other devices in the communication system 100, such as network controllers, mobility management entities and other network entities, which are not limited in the embodiment of the present application.

It should be understood that the terms "system" and "network" in this article are often used interchangeably in this article. The term "and/or" in this article is only an association relationship describing related objects, which means that there can be three types of relationships. For example, A and/or B can mean that there is A alone, A and B exist at the same time, and B exists alone. three situations. In addition, the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.

In order to understand the features and technical content of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and explanation purposes only, and are not used to limit the embodiments of the present invention.

Example one

The embodiment of the present invention provides a handover timing method, which is applied to a terminal device, as shown in FIG. 2, including:

Step 201: Receive at least one timer for at least one target network device, and/or a public timer;

Wherein, in the at least one timer corresponding to the at least one target network device, the timing duration of different timers may be the same or different;

In addition, the timing duration of the public timer may be greater than the timing duration of the timer with the largest timing duration among all timers; or, the timing duration of the public timer may also be the timing duration of all timers The sum of the duration; of course, the timing duration of the public timer can also be greater than the sum of the timing durations of all timers. The duration of at least one timer and the public timer can be set according to the actual situation, and it is not exhaustive here.

Further, after receiving at least one timer and/or public timer, the solution provided in this embodiment may further include: when initiating a connection to the target network device, based on the at least one timer, and/or , Public timer for processing.

The receiving at least one timer for at least one target network device, and/or, the public timer includes:

A handover command is received, and at least one timer for at least one target network device and/or a public timer is obtained through the handover command.

At least one timer of at least one target network device of the terminal device, and/or a public timer corresponding to at least one target network device, can be directly configured by the source network device, or can also be set by the target network device It is forwarded from the source network device to the terminal device.

The processing flow of handover can be seen in Figure 3, including:

The handover preparation stage includes steps 1-6 in the figure: the source network device sends measurement control to the terminal device; the terminal device sends a measurement report to the source network device after measuring multiple network devices or communities; the source network The device makes switching decisions based on the measurement report (or combined with RRM messages); the source network device sends a switching request to the target network device to make the target network device ready to switch; the target network device performs switching permission control according to the switching request; the target network When the route device determines to switch, it sends a switch request confirmation to the source network device.

Then perform the switching phase, including steps 7-11 in the figure. Specifically: the target network device generates an RRC message, sends the RRC connection reconfiguration message to the source network device, and the source network device sends it through the RRC connection reconfiguration message To the terminal device; after receiving the RRC connection reconfiguration message, the terminal device performs switching processing according to the connection reconfiguration message; then the source network device sends the SN status to the target network device; the terminal device synchronizes with the target network device, and then Receive the target network device for UL allocation, and send an RRC connection reconfiguration complete message to the target network device.

Finally, it enters the handover completion stage, including 12-18 in the figure. Specifically: the target network device sends a path switch request to the MME to notify the MME terminal device to change the community; the MME sends a bearer adjustment request to the service gateway, and the MME switches the downlink Path processing: After the service gateway completes the processing, it sends the bearer adjustment completion processing to the MME, and the MME sends a path switch request confirmation message to the target network device; the target network device notifies the source network device that the terminal device context is released by the source The network equipment releases resources.

In combination with this embodiment, when the terminal device has a target network device, the source network device can send a timer directly through a switch command, or send a timer through a forwarded reconfiguration message, that is, for the target network device When the terminal device has at least two target network devices, the source network device can directly configure at least two timers through the switch command, and/or the common timer, or it can be reconfigured through forwarding The message configures at least two timers for the terminal device, and/or, a common timer.

Among them, a message can be sent to the terminal device for the timer and/or public timer corresponding to each target network device; or, it can be the timer corresponding to each target network device of all target network devices. Add the device and/or public timer to the same message, and then only send one message to the terminal device.

It should be understood that in addition to the aforementioned timers and/or public timers, the reconfiguration message may also include: mobile control information, new C-RNTI, and security information of the second target network device; in addition, it may The options also include random access preamble, system message block (SIB) of the second target network device and other messages.

Specifically, this embodiment can be applied to the following multiple scenarios:

Scenario 1: The terminal device may have at least two target network devices, and all target network devices correspond to a common timer.

It should be understood that in this scenario, the timers can be sent to at least two target network devices respectively, that is to say, the timers of at least two target network devices are sent separately, and each timer can be a common timer if it is the same. ; Or, it is also possible to send only one public timer, and configure the public timer to apply to all target network devices.

In this scenario, the public timer can be obtained through the handover command, or the public timer can be obtained from the forwarded reconfiguration message.

The initiating a connection to a target network device based on the at least one timer and/or a common timer includes:

When the handover command is received, the public timer is started to initiate a connection to the first target network device.

Alternatively, the initiating connection to the target network device based on the at least one timer, and/or, a common timer, further includes:

If the received HO command carries a reconfiguration message containing at least two target network devices, the public timer can be started when the terminal device selects the first target network device to be accessed .

In this scenario, you can also use the same common timer specific processing method for multiple network devices, providing the following multiple sub-scenarios:

Sub scene one,

Every time the connection with the target network device fails and the second target network device is connected, restart the public timer, specifically:

If the connection to the first target network device is successfully initiated within the time duration of the timer, the public timer is stopped.

If the public timer expires and/or the connection with the first target network device fails, it is determined that the terminal device fails to switch to the first target network device.

When it is determined that the terminal device fails to switch to the first target network device, the method further includes:

When the connection to the first target network device fails, or when the public timer stops and the connection to the first target network device is unsuccessful, the second target network device is determined, the public timer is restarted, and the public timer is sent to the second target The network device initiates a connection.

Wherein, the method for determining the second target network device may include one of the following:

Re-accept the switching command sent by the source network device, and obtain the second target network device based on the switching command; wherein, the switching command includes the second target network device reselected by the network side for the terminal device.

Or, if the reconfiguration message received by the terminal device carries messages of at least two target network devices, the second target network device is selected from the at least two target network devices.

Wherein, the method of selecting the second target network device from the at least two target network devices may be randomly selecting the second target network device from the at least two target network devices, or based on at least two target network devices. Select the second target network device according to the priority order of selection of the target network device.

The selection priority order may be a parameter set by the network side for different target network equipment according to actual conditions; the network side may refer to the measurement report of the terminal equipment to set different selection priority orders for different target network equipment. For example, if the signal measurement quality in the measurement report is higher, the selection priority can be set to be higher, and vice versa, the selection priority angle can be set; and/or set according to the actual distance of the target network device, and the distance from the current The selection priority of the source network device that is closer in actual distance is higher (or lower); of course, there can be other setting methods in actual processing, which are not exhaustively listed in this embodiment.

It should be understood that when switching processing is performed for the second target network device, the processing method for the first target network device can be used for processing, but it is not repeated here.

When the public timer expires, it is confirmed that the handover fails, and the connection with the source network device is returned, or the connection re-establishment is initiated. Specifically, when the switching of the first target network device or the second target network device fails, it can return to the connection of the source network device or initiate a connection reestablishment to the new target network device. Among them, the new target network device is different from the target network device that failed this time.

It should also be understood that when the connection to the second target network device is re-initiated, the second target network device can be used as the new first target network device for subsequent operations, that is, when the new first target network device When a target network device is successfully connected, it can be determined that the switch is successful. If the new first target network device fails to connect, a new second target network device is selected again, and the process is looped.

When the second target network device is determined, the public timer is restarted, and the connection is initiated to the second target network device, the method further includes:

Determine whether the number of restarts of the public timer exceeds a preset threshold of times, and if it exceeds, confirm that the handover fails, return to the connection with the source network device, or initiate a connection re-establishment; wherein, the threshold of the preset times may In order to set according to the actual situation, for example, you can restart the public timer more than 5 times to confirm that there is no suitable target network device to switch, so as to judge the switch failure. Of course, you can also determine the preset according to the number of target network devices. Set the frequency threshold. For example, the preset frequency threshold can be 2/3 of the number of target network devices. If there are 9 target network devices, the public timer can be restarted 6 times; in addition, there can be other presets The method for setting the frequency threshold is just not exhaustively listed in this embodiment.

Or, it is judged whether the number of times of reselecting the target network device exceeds the preset selection threshold, and if it exceeds, it is confirmed that the switching has failed, and the connection with the source network device is returned, or the connection reconstruction is initiated. Wherein, the preset selection threshold can be set according to actual conditions. For example, the target network device can be reselected more than 3 times, and it is confirmed that there is no suitable target network device to switch, so as to determine that the switch fails; of course; The preset threshold can also be determined according to the number of target network devices. For example, the default selection threshold can be 2/3 of the number of target network devices. If there are 9 target network devices, you can select the target again If the network device exceeds 6 times, it is determined that the handover has failed; in addition, there may be other methods for setting the threshold of the preset times, but this embodiment will not be exhaustive.

Sub-scene two,

Multiple network devices share a common timer, and each time the connection to the target network device fails, the target network device is directly reselected until the common timer stops. specific:

When the connection to the first target network device fails and the public timer has not timed out, selecting a second target network device from at least one target network device to initiate a connection to the second target network device;

Or, when the connection of the first target network device fails and the public timer does not expire, the second target network device configured in the handover command is acquired, and the connection is initiated to the second target network device.

Wherein, the method of selecting the second target network device from the at least two target network devices may be randomly selecting the second target network device from the at least two target network devices, or based on at least two target network devices. Select the second target network device according to the priority order of selection of the target network device.

The selection priority order may be a parameter set by the network side for different target network equipment according to actual conditions; the network side may refer to the measurement report of the terminal equipment to set different selection priority orders for different target network equipment. For example, if the signal measurement quality in the measurement report is higher, the selection priority can be set to be higher, and vice versa, the selection priority angle can be set; and/or set according to the actual distance of the target network device, and the distance from the current The selection priority of the source network device that is closer in actual distance is higher (or lower); of course, there can be other setting methods in actual processing, which are not exhaustively listed in this embodiment.

When the second target network device is reselected from at least one network device each time, there is no need to maintain a connection with the source network device; and each time the switch command is reacquired, the second target is based on the configuration of the switch command In the process of the network device re-initiating the connection, it can be a connection that returns to the source network device every time the connection fails.

It should be pointed out that after initiating a connection to the second target network device, the second target network device can be used as the first target network device again to continue to perform the operations in this scenario, and then, when the new first target network When the connection of the road device fails, reselect the new second target network device again, and do so in a loop until the public timer stops, when the target network device that can be connected is still not selected, you can confirm that the switch failed , Return to the connection with the source network device, or initiate connection re-establishment.

Scene two,

The terminal device has at least two target network devices, and each target network device corresponds to a timer.

It should be understood that in this scenario, at least two timers configured by the source network device for at least two target network devices; wherein the timing duration of the timers corresponding to different target network devices can be the same or It can be different and can be determined by each target network device, which is not limited in this embodiment.

In this scenario, the source network device can directly carry a timer in the handover command and send it to the terminal device; or, the source network device can forward the reconfiguration messages of at least two target network devices to the terminal device.

The initiating a connection to a target network device based on the at least one timer and/or a common timer includes:

When the switching command is received, the first timer for the first target network device is started, and a connection is initiated to the first target network device.

Further, if the connection to the first target network device is successfully initiated within the time duration of the first timer, the first timer is stopped.

If the first timer expires and/or the connection with the first target network device fails, it is determined that the terminal device fails to switch to the first target network device.

When it is determined that the terminal device fails to switch to the first target network device, the method further includes:

When the connection of the first target network device fails, select a second target network device from at least one target network device to initiate the connection, and start the timer of the second target network device;

Or, when the connection of the first target network device fails, obtain the second target network device configured in the switching command, initiate a connection to the second target network device, and start the timing of the second target network device Device.

Wherein, the method for selecting a second target network device from the at least two target network devices may be randomly selecting the second target network device from at least two target network devices, or based on at least two target network devices. Select the second target network device according to the priority order of selection of the target network device.

The selection priority order may be a parameter set by the network side for different target network equipment according to actual conditions; the network side may refer to the measurement report of the terminal equipment to set different selection priority orders for different target network equipment. For example, if the signal measurement quality in the measurement report is higher, the selection priority can be set to be higher, and vice versa, the selection priority angle can be set; and/or set according to the actual distance of the target network device, and the distance from the current The selection priority of the source network device that is closer in actual distance is higher (or lower); of course, there can be other setting methods in actual processing, which are not exhaustively listed in this embodiment.

It should also be pointed out that in this scenario, when the second target network device is selected to initiate a connection, the second target network device selected this time can be used as the new first target network device. Accordingly, the second timing The device is used as a new first timer for switching connection control; that is, when the new first target network device is not successfully connected when the first timer ends, the new second target network device is selected again, And start the second timer corresponding to the new second target network device, and do so in a loop.

Further, the ending method of the above loop processing can be to determine whether the number of times to reselect a new target network device exceeds a preset selection threshold, and if it exceeds, it is determined that the handover has failed; or, it can also be determined to restart the new network device. If the number of timers exceeds the preset number threshold, if it exceeds, it is determined that the handover fails. For the determination method of the preset selection threshold and the preset number of times threshold, please refer to the description in scenario 1, which will not be repeated here.

When the timer expires, it is confirmed that the handover has failed, and the connection with the source network device is returned, or the connection reconstruction is initiated. Specifically, for the first target network device or the second target network device, the judgment method of whether the handover is successful can adopt the above description; and, when the handover fails, both can return to the connection of the source network device or restart. Initiate connection reestablishment to the new second target network device. Wherein, the new second target network device is different from the second target network device that failed this time.

Scene three

The terminal device has at least two target network devices, each target network device corresponds to a timer, and all target network devices share a common timer. It should be understood that the timing duration of the timers corresponding to different target network devices may be the same or different; the timing duration of the public timer may be greater than the timing of the timer with the largest timing duration among all timers Duration; or, the timing duration of the public timer may also be the sum of timing durations of all timers; of course, the timing duration of the public timer may also be greater than the sum of timing durations of all timers . The duration of at least one timer and the public timer can be set according to the actual situation, and it is not exhaustive here.

In this scenario, the at least two timers corresponding to the at least two target network devices can be obtained from the reconfiguration message forwarded by the source base station; or the source network device directly sets at least two timers in the handover command to send To the terminal equipment.

The initiating a connection to a target network device based on the at least one timer and/or a common timer includes:

When the handover command is received, the first timer of the first target network device is started, and the public timer is started to initiate a connection to the first target network device.

Further, if the connection to the first target network device is successfully initiated within the time duration of the first timer, the first timer is stopped. If the first timer expires and/or the connection with the first target network device fails, it is determined that the terminal device fails to switch to the first target network device.

After the connection is initiated to the first target network device, the method further includes:

When the first timer of the first target network device is stopped and/or the connection to the first target network device fails, if the public timer does not expire, the second target network is selected from at least one target network device Device, initiate a connection to the second target network device and start the timer of the second target network device;

Or, when the first timer of the first target network device stops and/or the connection to the first target network device fails, if the public timer does not expire, the second target network device is acquired based on the switching command, and The second target network device initiates a connection and starts a timer of the second target network device.

Wherein, the method for selecting a second target network device from the at least two target network devices may be randomly selecting the second target network device from at least two target network devices, or based on at least two target network devices. Select the second target network device according to the priority order of selection of the target network device.

The selection priority order may be a parameter set by the network side for different target network equipment according to actual conditions; the network side may refer to the measurement report of the terminal equipment to set different selection priority orders for different target network equipment. For example, if the signal measurement quality in the measurement report is higher, the selection priority can be set to be higher, and vice versa, the selection priority angle can be set; and/or set according to the actual distance of the target network device, and the distance from the current The selection priority of the source network device that is closer in actual distance is higher (or lower); of course, there can be other setting methods in actual processing, which are not exhaustively listed in this embodiment.

It should also be pointed out that in this scenario, when the second target network device is selected to initiate a connection, the second target network device selected this time can be used as the new first target network device. Accordingly, the second timing The device is used as a new first timer for switching connection control; that is, when the new first target network device is not successfully connected when the first timer ends, the new second target network device is selected again, And start the second timer corresponding to the new second target network device, and do so in a loop.

Further, the method for ending the loop processing described above may be, when the public timer expires, confirm that the handover fails, return to the connection with the source network device, or initiate connection re-establishment.

It should also be pointed out that when it is determined that the handover fails and the connection to the source network device is returned, or when the connection is initiated to the target network device, the terminal device in this embodiment can also retain the connection with the source network device. The connection; wherein the terminal device retains the first protocol stack and the first related key with the source network device, and maintains the second protocol stack and the second related key with the first target network device;

Wherein, the first related key is different from the second related key. The second correlation key can be generated from the first correlation key.

Among them, the first protocol stack and the second protocol stack may be the same or different, or at least partially different. For example, when targeting a 5G system, they may be the terminal device and the source network device, and the terminal device and the first target network. Devices maintain different service data application protocols (SDAP, Service Data Adaptation Protocol), different packet data convergence protocols (PDCP, Packet Data Convergence Protocol), different radio link layer control protocols (RLC, Radio Link Control), Different media access control (MAC) entities, different low layer entities; when targeting the 4G system, it can be maintained between the terminal device and the source network device, and between the terminal device and the first target network device Different packet data convergence protocols (PDCP, Packet Data Convergence Protocol), different radio link layer control protocols (RLC, Radio Link Control), different media access control (MAC) entities, and different low layer entities . In addition, in the solution provided in this embodiment, in order to ensure that different keys are used, the PDCPs of the first protocol stack and the second protocol stack must be different. At least one of SDAP, RLC, MAC, and physical layer may be the same or different. Alternatively, the first protocol stack and the second protocol stack may share at least one of SDAP, RLC, MAC, and physical layer, or may have SDAP, RLC, MAC, and physical layer respectively.

The first target network device and the second target network device in this embodiment are the target network devices when the terminal device is switched; or, the first target network device and the second target network device are auxiliary Node SN, the source network device is the master node MN. It should be noted here that in the Long Term Evolution (LTE) system, SN is called SCG, and in New Radio (NR) it is SN, which refers to the same concept, which is the second service network equipment in the DC scenario. The applicable scenarios of this embodiment are: the terminal maintains a connection with the source network device and fails to connect with the target network device; the terminal source network device is disconnected, and the connection with the target network device is successful; the auxiliary community group (SCG) is connected Failed, SCG failed to change the connection. Of course, there can also be that in a scenario where multiple SCGs are configured, one SCG connection fails; in a scenario where multiple target communities are configured, one target community fails to connect. There may also be other applicable scenarios, but it is not exhaustively listed in this embodiment.

It can be seen that by adopting the above solution, at least one timer and/or public timer corresponding to at least one target network device can be configured; so that when the terminal device is configured with at least one target network device, it is based on the corresponding timer And/or the public timer controls the switching process, so as to ensure the processing efficiency of re-establishing a connection with the target network device.

Embodiment two

The embodiment of the present invention provides a handover timing method, which is applied to a source network device, as shown in FIG. 4, including:

Step 401: Configure a terminal device with at least one timer for at least one target network device, and/or a public timer; wherein the duration of the public timer is at least greater than the timer for at least one target network device The maximum length of time.

In addition, the timing duration of the public timer may be greater than the timing duration of the timer with the largest timing duration among all timers; or, the timing duration of the public timer may also be the timing duration of all timers The sum of the duration; of course, the timing duration of the public timer can also be greater than the sum of the timing durations of all timers. The duration of at least one timer and the public timer can be set according to the actual situation, and it is not exhaustive here.

The configuration of the terminal device with at least one timer for at least one target network device, and/or a common timer, includes:

At least one timer for at least one target network device and/or a common timer is carried in the handover command, and the handover command is sent to the terminal device.

The at least one timer of the at least one target network device of the terminal device can be configured by the source network device directly through a switching command, or it can also be forwarded by the target network device to the terminal device through the source network device.

The processing flow of handover can be seen in Figure 3, including:

The handover preparation stage includes steps 1-6 in the figure: the source network device sends measurement control to the terminal device; the terminal device sends a measurement report to the source network device after measuring multiple network devices or communities; the source network The device makes switching decisions based on the measurement report (or combined with RRM messages); the source network device sends a switching request to the target network device to make the target network device ready to switch; the target network device performs switching permission control according to the switching request; the target network When the route device determines to switch, it sends a switch request confirmation to the source network device.

Then perform the switching phase, including steps 7-11 in the figure. Specifically: the target network device generates an RRC message, sends the RRC connection reconfiguration message to the source network device, and the source network device sends it through the RRC connection reconfiguration message To the terminal device; after receiving the RRC connection reconfiguration message, the terminal device performs switching processing according to the connection reconfiguration message; then the source network device sends the SN status to the target network device; the terminal device synchronizes with the target network device, and then Receive the target network device for UL allocation, and send an RRC connection reconfiguration complete message to the target network device.

Finally, it enters the handover completion stage, including 12-18 in the figure. Specifically: the target network device sends a path switch request to the MME to notify the MME terminal device to change the community; the MME sends a bearer adjustment request to the service gateway, and the MME switches the downlink Path processing: After the service gateway completes the processing, it sends the bearer adjustment completion processing to the MME, and the MME sends a path switch request confirmation message to the target network device; the target network device notifies the source network device that the terminal device context is released by the source The network equipment releases resources.

In combination with this embodiment, when the terminal device has a target network device, the source network device can send a timer directly through a switch command, or send a timer by forwarding a reconfiguration message, which is specific to the target network device. A timer; when the terminal device has at least two target network devices, the source network device can configure at least two timers directly through the switch command, and/or, a common timer, or it can be reconfigured through forwarding The message configures at least two timers for the terminal device, and/or, a common timer.

Among them, a message can be sent to the terminal device for the timer and/or public timer corresponding to each target network device; or, it can be the timer corresponding to each target network device of all target network devices. Add the device and/or public timer to the same message, and then only send one message to the terminal device.

It should be understood that in addition to the aforementioned timers and/or public timers, the reconfiguration message may also include: mobile control information, new C-RNTI, and security information of the second target network device; in addition, it may The options also include random access preamble, system message block (SIB) of the second target network device and other messages.

The method further includes: selecting a target network device based on a measurement report corresponding to at least one network device; or, randomly selecting a target network device from the at least one network device.

Among them, selecting the target network device can be when the source network device receives the measurement report of at least one network device from the terminal device, select at least one target network device for the terminal device; and then add at least one target network device Device-related information is sent to the terminal device through a reconfiguration message or a switch command; it should be pointed out that when sending at least one target network device, at least one timer corresponding to at least one target network device needs to be added, and/or public Timer.

And/or, selecting the target network device can also be that when the terminal device fails to connect to the first target network device, the source network device selects a second target network for the terminal device from at least one target network device Device and send the selected second target network device to the terminal device through a reconfiguration message or a switching command; it should be pointed out that when sending the second target network device, you also need to add the second target network device corresponding to the second target network device. Two timers.

The first target network device and the second target network device in this embodiment are the target network devices when the terminal device is switched; or, the first target network device and the second target network device are auxiliary Node SN, the source network device is the master node MN. It should be noted here that in the Long Term Evolution (LTE) system, SN is called SCG, and in New Radio (NR) it is SN, which refers to the same concept, which is the second service network equipment in the DC scenario. The applicable scenarios of this embodiment are: the terminal maintains a connection with the source network device and fails to connect with the target network device; the terminal source network device is disconnected, and the connection with the target network device is successful; the auxiliary community group (SCG) is connected Failed, SCG failed to change the connection. Of course, there can also be that in a scenario where multiple SCGs are configured, one SCG connection fails; in a scenario where multiple target communities are configured, one target community fails to connect. There may also be other applicable scenarios, but it is not exhaustively listed in this embodiment.

It can be seen that by adopting the above solution, at least one timer and/or public timer corresponding to at least one target network device can be configured; so that when the terminal device is configured with at least one target network device, it is based on the corresponding timer And/or the public timer controls the switching process, so as to ensure the processing efficiency of re-establishing a connection with the target network device.

Embodiment three

The embodiment of the present invention provides a terminal device, as shown in FIG. 5, including:

The first communication unit 51 receives at least one timer for at least one target network device, and/or a public timer; wherein the duration of the public timer is at least greater than the timer for at least one target network device The maximum duration of; based on the at least one timer, and/or, a common timer, initiate a connection to the target network device.

Wherein, in the at least one timer corresponding to the at least one target network device, the timing duration of different timers may be the same or different;

In addition, the timing duration of the public timer may be greater than the timing duration of the timer with the largest timing duration among all timers; or, the timing duration of the public timer may also be the timing duration of all timers The sum of the duration; of course, the timing duration of the public timer can also be greater than the sum of the timing durations of all timers. The duration of at least one timer and the public timer can be set according to the actual situation, and it is not exhaustive here.

The first communication unit 51 receives the reconfiguration message of the target network device forwarded by the source network device, and obtains at least one timer for at least one target network device carried in the reconfiguration message, and/or, Public timer

Or, receiving a switching command from the source network device, and obtaining at least one timer for at least one target network device and/or a common timer through the switching command.

That is to say, at least one timer of at least one target network device of the terminal device, and/or a public timer corresponding to at least one target network device, can be directly configured by the source network device, or can also be configured through The target network device forwards the source network device to the terminal device.

The processing flow of handover can be seen in Figure 3, including:

The handover preparation stage includes steps 1-6 in the figure: the source network device sends measurement control to the terminal device; the terminal device sends a measurement report to the source network device after measuring multiple network devices or communities; the source network The device makes switching decisions based on the measurement report (or combined with RRM messages); the source network device sends a switching request to the target network device to make the target network device ready to switch; the target network device performs switching permission control according to the switching request; the target network When the route device determines to switch, it sends a switch request confirmation to the source network device.

Then perform the switching phase, including steps 7-11 in the figure. Specifically: the target network device generates an RRC message, sends the RRC connection reconfiguration message to the source network device, and the source network device sends it through the RRC connection reconfiguration message To the terminal device; after receiving the RRC connection reconfiguration message, the terminal device performs switching processing according to the connection reconfiguration message; then the source network device sends the SN status to the target network device; the terminal device synchronizes with the target network device, and then Receive the target network device for UL allocation, and send an RRC connection reconfiguration complete message to the target network device.

Finally, it enters the handover completion stage, including 12-18 in the figure. Specifically: the target network device sends a path switch request to the MME to notify the MME terminal device to change the community; the MME sends a bearer adjustment request to the service gateway, and the MME switches the downlink Path processing: After the service gateway completes the processing, it sends the bearer adjustment completion processing to the MME, and the MME sends a path switch request confirmation message to the target network device; the target network device notifies the source network device that the terminal device context is released by the source The network equipment releases resources.

In combination with this embodiment, when the terminal device has a target network device, the source network device can send a timer directly through a switch command, or send a timer by forwarding a reconfiguration message, which is specific to the target network device. A timer; when the terminal device has at least two target network devices, the source network device can directly configure at least two timers for the terminal device through the switching command, and/or, a common timer, or, through forwarding The reconfiguration message configures at least two timers for the terminal device, and/or, a common timer.

Among them, a message can be sent to the terminal device for the timer and/or public timer corresponding to each target network device; or, it can be the timer corresponding to each target network device of all target network devices. Add the device and/or public timer to the same message, and then only send one message to the terminal device.

It should be understood that in addition to the aforementioned timers and/or public timers, the reconfiguration message may also include: mobile control information, new C-RNTI, and security information of the second target network device; in addition, it may The options also include random access preamble, system message block (SIB) of the second target network device and other messages.

Specifically, this embodiment can be applied to the following multiple scenarios:

Scenario 1: The terminal device may have at least two target network devices, and all target network devices correspond to a common timer.

It should be understood that in this scenario, the timers can be sent to at least two target network devices respectively, that is to say, the timers of at least two target network devices are sent separately, and each timer can be a common timer if it is the same. ; Or, it is also possible to send only one public timer, and configure the public timer to apply to all target network devices.

In this scenario, the public timer can be obtained through the handover command, or the public timer can be obtained from the forwarded reconfiguration message.

The terminal device also includes:

The first processing unit 52, when receiving the handover command, starts a public timer, and initiates a connection to the first target network device through the first communication unit 51.

Alternatively, the initiating connection to the target network device based on the at least one timer, and/or, a common timer, further includes:

The first processing unit 52, if the received HO command carries a reconfiguration message containing at least two target network devices, the terminal device can select the first target network device to be accessed. Time, start a public timer.

In this scenario, you can also use the same common timer specific processing method for multiple network devices, providing the following multiple sub-scenarios:

Sub scene one,

Every time the connection with the target network device fails and the second target network device is connected, restart the public timer, specifically:

The first processing unit 52 stops the public timer if it successfully initiates a connection to the first target network device within the time duration of the timer.

If the public timer expires and/or the connection with the first target network device fails, it is determined that the terminal device fails to switch to the first target network device.

When it is determined that the terminal device fails to switch to the first target network device, the first processing unit 52 fails to connect to the first target network device, or when the public timer stops and connects to the first target network device When unsuccessful, the second target network device is determined, the public timer is restarted, and a connection is initiated to the second target network device through the first communication unit 51.

Wherein, the method for determining the second target network device may include one of the following:

The first processing unit 52 re-accepts the switching command sent by the source network device, and obtains the second target network device based on the switching command; wherein the switching command includes the second target network device reselected by the network side for the terminal device .

Or, if the reconfiguration message received by the terminal device carries messages of at least two target network devices, the second target network device is selected from the at least two target network devices.

Wherein, the method for selecting the second target network device from the at least two target network devices may be the first processing unit 52 randomly selecting the second target network device from the at least two target network devices Or, select the second target network device based on the selection priority order of at least two target network devices.

The selection priority order may be a parameter set by the network side for different target network equipment according to actual conditions; the network side may refer to the measurement report of the terminal equipment to set different selection priority orders for different target network equipment. For example, if the signal measurement quality in the measurement report is higher, the selection priority can be set to be higher, and vice versa, the selection priority angle can be set; and/or set according to the actual distance of the target network device, and the distance from the current The selection priority of the source network device that is closer in actual distance is higher (or lower); of course, there can be other setting methods in actual processing, which are not exhaustively listed in this embodiment.

It should be understood that when switching processing is performed for the second target network device, the processing method for the first target network device can be used for processing, but it is not repeated here.

When the public timer expires, it is confirmed that the handover fails, and the connection with the source network device is returned, or the connection re-establishment is initiated. Specifically, when the switching of the first target network device or the second target network device fails, it can return to the connection of the source network device or initiate a connection reestablishment to the new target network device. Among them, the new target network device is different from the target network device that failed this time.

It should also be understood that when the connection to the second target network device is re-initiated, the second target network device can be used as the new first target network device for subsequent operations, that is, when the new first target network device When a target network device is successfully connected, it can be determined that the switch is successful. If the new first target network device fails to connect, a new second target network device is selected again, and the process is looped.

When the second target network device is determined, the public timer is restarted, and a connection is initiated to the second target network device, the first processing unit 52 determines whether the number of restarts of the public timer exceeds a preset value. Set the threshold for the number of times. If it exceeds, confirm that the handover fails and return to the connection with the source network device or initiate a connection re-establishment; wherein, the threshold for the preset number of times can be set according to actual conditions, for example, it can be restarting public If the timer exceeds 5 times, it is confirmed that there is no suitable target network device to switch, so as to determine that the switch has failed. Of course, the preset number threshold can also be determined according to the number of target network devices. For example, the preset number threshold can be the target 2/3 of the number of network devices. Assuming that there are 9 target network devices, the public timer can be restarted 6 times; in addition, there can be other preset times threshold setting methods, but not in this embodiment Exhaustively.

Alternatively, the first processing unit 52 determines whether the number of times of reselecting the target network device exceeds a preset selection threshold, and if it exceeds, confirms that the switching has failed, returns to the connection with the source network device, or initiates connection reestablishment. Wherein, the preset selection threshold can be set according to actual conditions. For example, the target network device can be reselected more than 3 times, and it is confirmed that there is no suitable target network device to switch, so as to determine that the switch fails; of course; The preset threshold can also be determined according to the number of target network devices. For example, the default selection threshold can be 2/3 of the number of target network devices. If there are 9 target network devices, you can select the target again If the network device exceeds 6 times, it is determined that the handover has failed; in addition, there may be other methods for setting the threshold of the preset times, but this embodiment will not be exhaustive.

Sub-scene two,

Multiple network devices share a common timer, and each time the connection to the target network device fails, the target network device is directly reselected until the common timer stops. specific:

The first processing unit 52, when the connection to the first target network device fails, and the public timer has not timed out, select the second target network device from at least one target network device, and send it to the network device through the first communication unit 51 The second target network device initiates a connection;

Or, when the connection of the first target network device fails and the public timer does not expire, the second target network device configured in the switching command is acquired, and the second target network device is sent to the second target network device through the first communication unit 51 Initiate the connection.

Wherein, the method of selecting the second target network device from the at least two target network devices may be randomly selecting the second target network device from the at least two target network devices, or based on at least two target network devices. Select the second target network device according to the priority order of selection of the target network device.

The selection priority order may be a parameter set by the network side for different target network equipment according to actual conditions; the network side may refer to the measurement report of the terminal equipment to set different selection priority orders for different target network equipment. For example, if the signal measurement quality in the measurement report is higher, the selection priority can be set to be higher, and vice versa, the selection priority angle can be set; and/or set according to the actual distance of the target network device, and the distance from the current The selection priority of the source network device that is closer in actual distance is higher (or lower); of course, there can be other setting methods in actual processing, which are not exhaustively listed in this embodiment.

When the second target network device is reselected from at least one network device each time, there is no need to maintain a connection with the source network device; and each time the switch command is reacquired, the second target is based on the configuration of the switch command In the process of the network device re-initiating the connection, it can be a connection that returns to the source network device every time the connection fails.

It should be pointed out that after initiating a connection to the second target network device, the second target network device can be used as the first target network device again to continue to perform the operations in this scenario, and then, when the new first target network When the connection of the road device fails, reselect the new second target network device again, and do so in a loop until the public timer stops, when the target network device that can be connected is still not selected, you can confirm that the switch failed , Return to the connection with the source network device, or initiate connection re-establishment.

Scene two,

The terminal device has at least two target network devices, and each target network device corresponds to a timer.

It should be understood that in this scenario, at least two timers configured by the source network device for at least two target network devices; wherein the timing duration of the timers corresponding to different target network devices can be the same or It can be different and can be determined by each target network device, which is not limited in this embodiment.

In this scenario, the source network device can directly carry a timer in the handover command and send it to the terminal device; or, the source network device can forward the reconfiguration messages of at least two target network devices to the terminal device.

The first processing unit 52, when receiving the switching command, starts a first timer for the first target network device, and initiates a connection to the first target network device through the first communication unit 51.

Further, if the connection to the first target network device is successfully initiated within the time duration of the first timer, the first timer is stopped.

If the first timer expires and/or the connection with the first target network device fails, it is determined that the terminal device fails to switch to the first target network device.

When it is determined that the terminal device fails to switch to the first target network device, the first processing unit 52:

When the connection of the first target network device fails, select a second target network device from at least one target network device to initiate the connection, and start the timer of the second target network device;

Or, when the connection of the first target network device fails, obtain the second target network device configured in the switching command, initiate a connection to the second target network device, and start the timing of the second target network device Device.

Wherein, the method for selecting a second target network device from the at least two target network devices may be randomly selecting the second target network device from at least two target network devices, or based on at least two target network devices. Select the second target network device according to the priority order of selection of the target network device.

The selection priority order may be a parameter set by the network side for different target network equipment according to actual conditions; the network side may refer to the measurement report of the terminal equipment to set different selection priority orders for different target network equipment. For example, if the signal measurement quality in the measurement report is higher, the selection priority can be set to be higher, and vice versa, the selection priority angle can be set; and/or set according to the actual distance of the target network device, and the distance from the current The selection priority of the source network device that is closer in actual distance is higher (or lower); of course, there can be other setting methods in actual processing, which are not exhaustively listed in this embodiment.

It should also be pointed out that in this scenario, when the second target network device is selected to initiate a connection, the second target network device selected this time can be used as the new first target network device. Accordingly, the second timing The device is used as a new first timer for switching connection control; that is, when the new first target network device is not successfully connected when the first timer ends, the new second target network device is selected again, And start the second timer corresponding to the new second target network device, and do so in a loop.

Further, the ending method of the above loop processing may be that the first processing unit 52 determines whether the number of times to reselect a new target network device exceeds a preset selection threshold, and if it exceeds, determines that the handover fails; or, It can be used to determine whether the number of restarts of the new timer exceeds the preset number threshold, and if it exceeds, it is determined that the handover fails. For the determination method of the preset selection threshold and the preset number of times threshold, please refer to the description in scenario 1, which will not be repeated here.

When the timer expires, it is confirmed that the handover has failed, and the connection with the source network device is returned, or the connection reconstruction is initiated. Specifically, for the first target network device or the second target network device, the judgment method of whether the handover is successful can adopt the above description; and, when the handover fails, both can return to the connection of the source network device or restart. Initiate connection reestablishment to the new second target network device. Wherein, the new second target network device is different from the second target network device that failed this time.

Scene three

The terminal device has at least two target network devices, each target network device corresponds to a timer, and all target network devices share a common timer. It should be understood that the timing duration of the timers corresponding to different target network devices may be the same or different; the timing duration of the public timer may be greater than the timing of the timer with the largest timing duration among all timers Duration; or, the timing duration of the public timer may also be the sum of timing durations of all timers; of course, the timing duration of the public timer may also be greater than the sum of timing durations of all timers . The duration of at least one timer and the public timer can be set according to the actual situation, and it is not exhaustive here.

In this scenario, the at least two timers corresponding to the at least two target network devices can be obtained from the reconfiguration message forwarded by the source base station; or the source network device directly sets at least two timers in the handover command to send To the terminal equipment.

The first processing unit 52, when receiving the switching command, starts the first timer of the first target network device and starts the public timer, and initiates a connection to the first target network device through the first communication unit 51.

Further, if the connection to the first target network device is successfully initiated within the time duration of the first timer, the first timer is stopped. If the first timer expires and/or the connection with the first target network device fails, it is determined that the terminal device fails to switch to the first target network device.

After the connection is initiated to the first target network device, the first processing unit 52,

When the first timer of the first target network device is stopped and/or the connection to the first target network device fails, if the public timer does not expire, the second target network is selected from at least one target network device Device, initiate a connection to the second target network device and start the timer of the second target network device;

Or, when the first timer of the first target network device stops and/or the connection to the first target network device fails, if the public timer does not expire, the second target network device is acquired based on the switching command, and The second target network device initiates a connection and starts a timer of the second target network device.

Wherein, the method for selecting a second target network device from the at least two target network devices may be randomly selecting the second target network device from at least two target network devices, or based on at least two target network devices. Select the second target network device according to the priority order of selection of the target network device.

The selection priority order may be a parameter set by the network side for different target network equipment according to actual conditions; the network side may refer to the measurement report of the terminal equipment to set different selection priority orders for different target network equipment. For example, if the signal measurement quality in the measurement report is higher, the selection priority can be set to be higher, and vice versa, the selection priority angle can be set; and/or set according to the actual distance of the target network device, and the distance from the current The selection priority of the source network device that is closer in actual distance is higher (or lower); of course, there can be other setting methods in actual processing, which are not exhaustively listed in this embodiment.

It should also be pointed out that in this scenario, when the second target network device is selected to initiate a connection, the second target network device selected this time can be used as the new first target network device. Accordingly, the second timing The device is used as a new first timer for switching connection control; that is, when the new first target network device is not successfully connected when the first timer ends, the new second target network device is selected again, And start the second timer corresponding to the new second target network device, and do so in a loop.

Further, the method for ending the loop processing described above may be, when the public timer expires, confirm that the handover fails, return to the connection with the source network device, or initiate connection re-establishment.

It should also be pointed out that when it is determined that the handover fails and the connection to the source network device is returned, or when the connection is initiated to the target network device, the terminal device in this embodiment can also retain the connection with the source network device. The connection; wherein the terminal device retains the first protocol stack and the first related key with the source network device, and maintains the second protocol stack and the second related key with the first target network device;

Wherein, the first related key is different from the second related key. The second correlation key can be generated from the first correlation key.

Among them, the first protocol stack and the second protocol stack may be the same or different, or at least partially different. For example, when targeting a 5G system, they may be the terminal device and the source network device, and the terminal device and the first target network. Devices maintain different service data application protocols (SDAP, Service Data Adaptation Protocol), different packet data convergence protocols (PDCP, Packet Data Convergence Protocol), different radio link layer control protocols (RLC, Radio Link Control), Different media access control (MAC) entities, different low layer entities; when targeting the 4G system, it can be maintained between the terminal device and the source network device, and between the terminal device and the first target network device Different packet data convergence protocols (PDCP, Packet Data Convergence Protocol), different radio link layer control protocols (RLC, Radio Link Control), different media access control (MAC) entities, and different low layer entities . In addition, in the solution provided in this embodiment, in order to ensure that different keys are used, the PDCPs of the first protocol stack and the second protocol stack must be different. At least one of SDAP, RLC, MAC, and physical layer may be the same or different. Alternatively, the first protocol stack and the second protocol stack may share at least one of SDAP, RLC, MAC, and physical layer, or may have SDAP, RLC, MAC, and physical layer respectively.

The first target network device and the second target network device in this embodiment are the target network devices when the terminal device is switched; or, the first target network device and the second target network device are auxiliary Node SN, the source network device is the master node MN. It should be noted here that in the Long Term Evolution (LTE) system, SN is called SCG, and in New Radio (NR) it is SN, which refers to the same concept, which is the second service network equipment in the DC scenario. The applicable scenarios of this embodiment are: the terminal maintains a connection with the source network device and fails to connect with the target network device; the terminal source network device is disconnected, and the connection with the target network device is successful; the auxiliary community group (SCG) is connected Failed, SCG failed to change the connection. Of course, there can also be that in a scenario where multiple SCGs are configured, one SCG connection fails; in a scenario where multiple target communities are configured, one target community fails to connect. There may also be other applicable scenarios, but it is not exhaustively listed in this embodiment.

It can be seen that by adopting the above solution, at least one timer and/or public timer corresponding to at least one target network device can be configured; so that when the terminal device is configured with at least one target network device, it is based on the corresponding timer And/or the public timer controls the switching process, so as to ensure the processing efficiency of re-establishing a connection with the target network device.

Embodiment four

The embodiment of the present invention provides a source network device, as shown in FIG. 6, including:

The second communication unit 61 is configured to configure the terminal device with at least one timer for at least one target network device, and/or, a public timer; wherein the duration of the public timer is at least longer than that for at least one target network device The maximum duration of the timer.

In addition, the timing duration of the public timer may be greater than the timing duration of the timer with the largest timing duration among all timers; or, the timing duration of the public timer may also be the timing duration of all timers The sum of the duration; of course, the timing duration of the public timer can also be greater than the sum of the timing durations of all timers. The duration of at least one timer and the public timer can be set according to the actual situation, and it is not exhaustive here.

The second communication unit 61 carries at least one timer for at least one target network device and/or a common timer in the handover command, and sends the handover command to the terminal device.

Specifically, the at least one timer of at least one target network device of the terminal device can be configured directly through the switch command through the source network device, or it can also be forwarded by the target network device to the terminal device through the source network device .

The processing flow of handover can be seen in Figure 3, including:

The handover preparation stage includes steps 1-6 in the figure: the source network device sends measurement control to the terminal device; the terminal device sends a measurement report to the source network device after measuring multiple network devices or communities; the source network The device makes switching decisions based on the measurement report (or combined with RRM messages); the source network device sends a switching request to the target network device to make the target network device ready to switch; the target network device performs switching permission control according to the switching request; the target network When the route device determines to switch, it sends a switch request confirmation to the source network device.

Then perform the switching phase, including steps 7-11 in the figure. Specifically: the target network device generates an RRC message, sends the RRC connection reconfiguration message to the source network device, and the source network device sends it through the RRC connection reconfiguration message To the terminal device; after receiving the RRC connection reconfiguration message, the terminal device performs switching processing according to the connection reconfiguration message; then the source network device sends the SN status to the target network device; the terminal device synchronizes with the target network device, and then Receive the target network device for UL allocation, and send an RRC connection reconfiguration complete message to the target network device.

Finally, it enters the handover completion stage, including 12-18 in the figure. Specifically: the target network device sends a path switch request to the MME to notify the MME terminal device to change the community; the MME sends a bearer adjustment request to the service gateway, and the MME switches the downlink Path processing: After the service gateway completes the processing, it sends the bearer adjustment completion processing to the MME, and the MME sends a path switch request confirmation message to the target network device; the target network device notifies the source network device that the terminal device context is released by the source The network equipment releases resources.

In combination with this embodiment, when the terminal device has a target network device, the source network device can send a timer directly through a switch command, or send a timer by forwarding a reconfiguration message, which is specific to the target network device. A timer; when the terminal device has at least two target network devices, the source network device can directly configure at least two timers through the switch command, and/or, a common timer, or can forward reconfiguration messages Configure at least two timers for the terminal device, and/or, a common timer.

Among them, a message can be sent to the terminal device for the timer and/or public timer corresponding to each target network device; or, it can be the timer corresponding to each target network device of all target network devices. Add the device and/or public timer to the same message, and then only send one message to the terminal device.

It should be understood that in addition to the aforementioned timers and/or public timers, the reconfiguration message may also include: mobile control information, new C-RNTI, and security information of the second target network device; in addition, it may The options also include random access preamble, system message block (SIB) of the second target network device and other messages.

The source network equipment also includes:

The second processing unit 62 selects a target network device based on a measurement report corresponding to at least one network device; or, randomly selects a target network device from the at least one network device.

Among them, selecting the target network device can be when the source network device receives the measurement report of at least one network device from the terminal device, select at least one target network device for the terminal device; and then add at least one target network device Device-related information is sent to the terminal device through a reconfiguration message or a switch command; it should be pointed out that when sending at least one target network device, at least one timer corresponding to at least one target network device needs to be added, and/or public Timer.

And/or, selecting the target network device can also be that when the terminal device fails to connect to the first target network device, the source network device selects a second target network for the terminal device from at least one target network device Device and send the selected second target network device to the terminal device through a reconfiguration message or a switching command; it should be pointed out that when sending the second target network device, you also need to add the second target network device corresponding to the second target network device. Two timers.

The first target network device and the second target network device in this embodiment are the target network devices when the terminal device is switched; or, the first target network device and the second target network device are auxiliary Node SN, the source network device is the master node MN. It should be noted here that in the Long Term Evolution (LTE) system, SN is called SCG, and in New Radio (NR) it is SN, which refers to the same concept, which is the second service network equipment in the DC scenario. The applicable scenarios of this embodiment are: the terminal maintains a connection with the source network device and fails to connect with the target network device; the terminal source network device is disconnected, and the connection with the target network device is successful; the auxiliary community group (SCG) is connected Failed, SCG failed to change the connection. Of course, there can also be that in a scenario where multiple SCGs are configured, one SCG connection fails; in a scenario where multiple target communities are configured, one target community fails to connect. There may also be other applicable scenarios, but it is not exhaustively listed in this embodiment.

It can be seen that by adopting the above solution, at least one timer and/or public timer corresponding to at least one target network device can be configured; so that when the terminal device is configured with at least one target network device, it is based on the corresponding timer And/or the public timer controls the switching process, so as to ensure the processing efficiency of re-establishing a connection with the target network device.

FIG. 7 is a schematic structural diagram of a communication device 700 provided by an embodiment of the present application. The communication device may be the aforementioned terminal device or network device in this embodiment. The communication device 700 shown in FIG. 7 includes a processor 710, and the processor 710 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 7, the communication device 700 may further include a memory 720. The processor 710 can call and run a computer program from the memory 720 to implement the method in the embodiment of the present application.

The memory 720 may be a separate device independent of the processor 710, or it may be integrated in the processor 710.

Optionally, as shown in FIG. 7, the communication device 700 may further include a transceiver 730, and the processor 710 may control the transceiver 730 to communicate with other devices. Specifically, it may send messages or data to other devices, or receive other devices. Message or data sent by the device.

The transceiver 730 may include a transmitter and a receiver. The transceiver 730 may further include an antenna, and the number of antennas may be one or more.

Optionally, the communication device 700 may specifically be a network device in an embodiment of the present application, and the communication device 700 may implement the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, it is not here. Repeat it again.

Optionally, the communication device 700 may specifically be a terminal device or a network device in an embodiment of the application, and the communication device 700 may implement the corresponding processes implemented by the mobile terminal/terminal device in the various methods of the embodiments of the application. For the sake of brevity, I will not repeat them here.

Fig. 8 is a schematic structural diagram of a wafer of an embodiment of the present application. The chip 800 shown in FIG. 8 includes a processor 810, and the processor 810 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 8, the chip 800 may further include a memory 820. The processor 810 can call and run a computer program from the memory 820 to implement the method in the embodiment of the present application.

The memory 820 may be a separate device independent of the processor 810, or it may be integrated in the processor 810.

Optionally, the chip 800 may further include an input interface 830. Wherein, the processor 810 can control the input interface 830 to communicate with other devices or chips, specifically, can obtain messages or data sent by other devices or chips.

Optionally, the chip 800 may further include an output interface 840. The processor 810 can control the output interface 840 to communicate with other devices or chips, specifically, can output messages or data to other devices or chips.

Optionally, the chip can be applied to the network equipment in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the network equipment in the various methods of the embodiments of the present application. For the sake of brevity, details are not repeated here.

Optionally, the chip can be applied to the terminal device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the terminal device in each method of the embodiment of the present application. For the sake of brevity, details are not described herein again.

It should be understood that the chip mentioned in the embodiments of the present application may also be referred to as a system-level chip, a system-on-chip, a system-on-chip or a system-on-chip.

FIG. 9 is a schematic block diagram of a communication system 900 according to an embodiment of the present application. As shown in FIG. 9, the communication system 900 includes a terminal device 910 and a network device 920.

Wherein, the terminal device 910 can be used to implement the corresponding function implemented by the terminal device in the above method, and the network device 920 can be used to implement the corresponding function implemented by the network device in the above method. Repeat it again.

It should be understood that the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the above method embodiments can be completed through hardware integrated logic circuits in the processor or instructions in the form of software. The above-mentioned processor can be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), a dedicated integrated circuit (Application Specific Integrated Circuit, ASIC), a ready-made programmable gate array (Field Programmable Gate Array, FPGA), or Other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module can be located in random memory, flash memory, read-only memory, programmable read-only memory, or electrically readable, writable and programmable memory, registers, and other mature storage media in the field. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache memory. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory ( Synchronous DRAM, SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced SDRAM, ESDRAM), Synchronous Connection Dynamic Random Access Memory Body (Synchlink DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include but not limited to these and any other suitable types of memory.

It should be understood that the foregoing memory is exemplary but not restrictive. For example, the memory in the embodiment of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM). , DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is to say, the memory in the embodiments of the present application is intended to include but not limited to these and any other suitable types of memory.

The embodiment of the present application also provides a computer-readable storage medium for storing computer programs.

Optionally, the computer-readable storage medium can be applied to the network device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, I won't repeat them here.

Optionally, the computer-readable storage medium can be applied to the terminal device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application, for the sake of brevity , I won’t repeat it here.

The embodiment of the present application also provides a computer program product, including computer program instructions.

Optionally, the computer program product can be applied to the network device in the embodiment of this application, and the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of this application. For brevity, This will not be repeated here.

Optionally, the computer program product can be applied to the mobile terminal/terminal device in the embodiment of this application, and the computer program instructions make the computer execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of this application, For the sake of brevity, I will not repeat them here.

The embodiment of the application also provides a computer program.

Optionally, the computer program can be applied to the network device in the embodiment of the present application. When the computer program runs on the computer, the computer executes the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, I will not repeat them here.

Optionally, the computer program can be applied to the mobile terminal/terminal device in the embodiment of the present application. When the computer program runs on the computer, the computer can execute each method in the embodiment of the present application. For the sake of brevity, the corresponding process will not be repeated here.

A person of ordinary skill in the art can be aware that the units and algorithm steps described in the examples in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which is not repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or elements may be combined or may be Integrate into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The unit described as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed to multiple network units . Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in each embodiment of the present application may be integrated into one processing unit, or each unit may exist separately, or two or more units may be integrated into one unit.

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several The instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: flash drives, removable hard drives, read-only memory (Read-Only Memory,) ROM, random access memory (Random Access Memory, RAM), magnetic disks or optical disks, etc., which can store program codes Medium.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the patent application.

100: Communication system 110: network equipment 120: terminal equipment 201: Step 401: Step 51: The first communication unit 52: The first processing unit 61: The second communication unit 62: second processing unit 700: Communication equipment 710: processor 720: Memory 730: Transceiver 800: chip 810: processor 820: memory 830: input interface 840: output interface 900: Communication system 910: terminal equipment 920: network equipment

FIG. 1 is a schematic diagram 1 of a communication system architecture provided by an embodiment of the present application;

FIG. 2 is a first schematic flowchart of a handover timing method provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of a handover processing scenario provided by an embodiment of the present invention;

FIG. 4 is a second schematic diagram of the flow of a handover timing method provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of the structure of a terminal device provided by an embodiment of the present application;

FIG. 6 is a schematic diagram of the composition structure of a network device provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of the composition structure of a communication device provided by an embodiment of the present invention;

FIG. 8 is a schematic block diagram of a chip provided by an embodiment of the present application;

FIG. 9 is a second schematic diagram of a communication system architecture provided by an embodiment of the present application.

201: Step

Claims (20)

A handover timing method applied to terminal equipment, including: Receiving at least one timer for at least one target network device, and/or, a public timer; Wherein, the duration of the public timer is at least greater than the maximum duration of the timer for at least one target network device. The method according to claim 1, wherein the receiving at least one timer for at least one target network device, and/or a public timer, includes: A handover command is received, and at least one timer for at least one target network device and/or a public timer is obtained through the handover command. The method according to item 1 of the scope of patent application, wherein, after the receiving at least one timer for at least one target network device, and/or, after the public timer, the method further includes: When the handover command is received, the public timer is started to initiate a connection to the first target network device. The method according to item 3 of the scope of patent application, wherein, after initiating a connection to the first target network device, the method further includes: When the connection to the first target network device fails, or when the public timer stops and the connection to the first target network device is unsuccessful, the second target network device is determined, the public timer is restarted, and the public timer is sent to the second target The network device initiates a connection. The method according to item 4 of the scope of patent application, wherein when the determining the second target network device, restarting the public timer, and initiating a connection to the second target network device, the method further includes: Determine whether the number of restarts of the public timer exceeds a preset number threshold, and if it exceeds, confirm that the handover fails, return to the connection with the source network device, or initiate connection re-establishment; or, Determine whether the number of times of reselecting the target network device exceeds the preset selection threshold, if it exceeds, confirm that the switch has failed, return to the connection with the source network device, or initiate connection re-establishment. The method according to item 3 of the scope of patent application, wherein, after initiating a connection to the first target network device, the method further includes: When the connection to the first target network device fails and the public timer has not timed out, selecting a second target network device from at least one target network device to initiate a connection to the second target network device; or, When the connection of the first target network device fails and the public timer does not expire, the second target network device configured in the handover command is acquired, and a connection is initiated to the second target network device. The method according to item 6 of the scope of patent application, wherein the method further includes: When the public timer expires, it is confirmed that the handover fails, and the connection with the source network device is returned, or the connection re-establishment is initiated. The method according to item 1 of the scope of patent application, wherein, after the receiving at least one timer for at least one target network device, and/or, after the public timer, the method further includes: When the switching command is received, the first timer for the first target network device is started, and a connection is initiated to the first target network device. The method according to item 8 of the scope of patent application, wherein, after the initiating connection to the first target network device, the method further includes: When the connection of the first target network device fails, select a second target network device from at least one target network device to initiate the connection, and start the second timer of the second target network device; or, When the connection of the first target network device fails, obtain the second target network device configured in the switching command, initiate a connection to the second target network device, and start the second timing of the second target network device Device. The method according to item 1 of the scope of patent application, wherein, after the receiving at least one timer for at least one target network device, and/or, after the public timer, the method further includes: When the handover command is received, the first timer of the first target network device is started, and the public timer is started to initiate a connection to the first target network device. A terminal device, including: The first communication unit receives at least one timer for at least one target network device, and/or a public timer; wherein the duration of the public timer is at least greater than that of the timer for at least one target network device Maximum duration. The terminal device according to item 11 of the scope of patent application, wherein the first communication unit, A handover command is received, and at least one timer for at least one target network device and/or a public timer is obtained through the handover command. The terminal device according to item 11 of the scope of patent application, wherein the terminal device further includes: The first processing unit, when receiving the handover command, starts a public timer, and initiates a connection to the first target network device through the first communication unit. The terminal device according to item 13 of the scope of patent application, wherein the first processing unit fails when connecting to the first target network device, or when the public timer stops and connecting to the first target network device fails When determining the second target network device, restart the public timer, and initiate a connection to the second target network device through the first communication unit. The terminal device according to item 13 of the scope of patent application, wherein the first processing unit, When the connection to the first target network device fails and the public timer does not expire, a second target network device is selected from at least one target network device, and the second target network device is sent to the second target network device through the first communication unit Initiate a connection; or, When the connection of the first target network device fails and the public timer does not expire, the second target network device configured in the switching command is acquired, and a connection is initiated to the second target network device through the first communication unit. The terminal device according to item 11 of the scope of patent application, wherein the terminal device further includes: The first processing unit, when receiving the switching command, starts a first timer for the first target network device, and initiates a connection to the first target network device through the first communication unit. The terminal device according to item 11 of the scope of patent application, wherein the terminal device further includes: The first processing unit, when receiving the switching command, starts the first timer of the first target network device and starts the public timer, and initiates a connection to the first target network device through the first communication unit. The terminal device according to item 17 of the scope of patent application, wherein the first processing unit, When the first timer of the first target network device is stopped and/or the connection to the first target network device fails, if the public timer does not expire, the second target network is selected from at least one target network device Device, initiate a connection to the second target network device and start the timer of the second target network device; or, When the first timer of the first target network device stops and/or the connection to the first target network device fails, if the public timer does not expire, the second target network device is acquired based on the switching command, and the second target network device is sent to the second The target network device initiates a connection and starts a timer of the second target network device. The terminal device according to item 18 of the scope of patent application, wherein the first processing unit, when the public timer expires, confirms that the handover has failed, and controls the return of the connection to the source network device through the first communication unit, Or, initiate connection re-establishment. The terminal device according to item 11 of the scope of patent application, wherein: The first target network device and the second target network device are target network devices when the terminal device is switched; or, The first target network device and the second target network device are auxiliary nodes SN, and the source network device is a master node MN.

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